Name the laws that specifically exclude bitcoin.  This is nothing but an assumption on part of Wikipedia.  An assumption that goes against its own philosophy: "be bold".

As far as I can tell, it is not illegal for a charity to accept any valuable as a donation that isn't fiat money, as long as the charity declares it.

Also, laws differ from country to country.  WMF has 38 local chapters. Perhaps we should try our luck with those?